ALEKSANDER, R. P. : Hokkaido Puzzles. 1993. 39: 15-17.
ASTRÖM, L. : Cave & Karst in Sweden. 1988. 29: 12-13.

BAHL, J. : Die Saalfelder “Feengrotten”. 1988. 31: 20.
BLISTYAR, N. : Some new items from Romania. 1987. 26: 11.
BLISTYAR, N. : New from Romania. 1994. 43: 6.
BOWEN, T. : Elephant Trunk, a wonder of Guilin. 1983. 14: 3-4.
BREISCH, R. L. : Muhammed’s Caves. 1982. 6: 7-9.
BUSH, C. : A Look Beyond The “Nitre And Mining Bureau”. 1988. 31: 22.

CAMPBELL, A. : Images of Tsodilo Rock Art. 1992. 37: 16-17.
CARRIER, B. : About two Polish stamps. 1984. 16: 5.
CRESPO, J.F. : Toponimos Espanoles correspondientes a poblaciones con la palabra “cueva, cova, etc”. 1988. 28: 16-17.

DE SWART, H. :Expeditie Sterrengebergte. 1987. 27: 6.
DOBOSI, V.T. : Finds of Prehistoric men in Hungary. 1994. 43: 25.

FLÖSS, B. : The Martinswall near Zirl. 1988. 28: 32-35.
FOSKI, L. : Slovenia. Nature. The Skocjan caves. 1996. 50: 14.
FRUMKIN, A. : The Dead Sea Caves. 1985. 20: 4-6.

GOTTFRIED, H. : SAMONEX, ... cancellations.... 1988. 29: 15.
GROENENDIJK, T. : Another waterfall hiding caves! 1986. 23: 7.
GUILLAMON, F.G. : Spanish War Tax Stamps depicting a bat. 1981. 2: 2-4.

HARTMANN, H. : Das Geldloch im Ötscher, Niederösterreich - 1592-1992. 1993. 39: 12-14.
HEALEY, B. : There was a time when remote Islands had to rely on floating Tin Cans for Their mail delivery. 1992. 37: 21.
HOSBACH, E. : The Bärenhöhle, near Erpfingen, W. Germany. 1982. 8: 16.
HOSBACH, E. & VAN SOEREN. J.C. : Grotte de la deveze / St.Pons-Frankreich. 1988. 31: 21.

JARRAT, T. : Field checked - Durdle Door, Lulworth, Dorset, England. 1995. 47: 18.
JENKINS, E.R. : Information about ‘Mission Cave House’. 1983. 10: 12.

KATTINGER, E. : Velebit Weise wände zwischen Wäldern und Wogen. 1986. 23: 17.
KICK, W. : Leonardo da Vinci / Madonna delle Rocce - Madona of the Rocks. 1988. 29: 8-9.
KICK, W. : The Saalfelder Feengrotten (Fairy Caves). 1995. 47: 79.
KIDDLE, F. : Cave overprints on the stamp of Ceylon. 1990. 34: 12-13.
KIRBY, W. : Afka Falls (Lebanon). 1983. 12: 4.
KÜHN, K.H. : Ballade vom Rattenfänger. 1994. 44: 24-25.

LEHR, R. : The Giant Ice Cave on the Dachstein Mountain. 1988. 28: 24-30.
LÖW, M. : 10 Years Speotimis. 1985. 20: 7.
LÖW, M. : The Buhui Cave. 1985. 20: 8.

MANNING, P.I. : The Caves of Sof Omar (Ethiopia). 1983. 11: 8-9.
MAROTTA, C. : A Speleological stamp of Monticchio & S. Michele Cave. 1994. 45: 11.
MATHÈS, J. : Die Tropfsteinhöhle von Saint-Cézaire. 1985. 22: 8
MATHÈS, J. : Die Höhle von Thais (oder Tai). (From: Geologie). 1991.36: 7.

NIXON, R. : Bat checklist. 1988. 29: 6-7.
NOGRADY, G.L. & SCHUBERT, P. : István Plózer (1948-1977) - Divers Library. 1981. 3: 3.

OLDANI, M. : Neuer Werbedatumstempel in 1958 - St. Léonard (CH). 1994. 45: 12.
OLDHAM, T. : Bergwerk Seegrotte Hinterbrühl - Europas grösster unterirdischer See (6200 m2). 1985. 19: 2.

PADILLA, A. : La Cueva de Medrano, Prision de Cervantes. 1994. 43: 22-23.
PADILLA, A. : The cave of Medrano, Prision of Cervantes. 1994. 43: 24.
PEARMAN, H. : Towerkarst China. 1983. 14: 5.

REEKIE, S. : Niue Island. 1985. 21: 19-22.

SCHOELZEL, R. :...town Bom Jesus de Lapa (= cave)... 1986. 25: 12.
SLEZIN, Y. : About Dolina geyserov, Kamchatka, Russia. 1995. 46: 6.
STEPHENS, G. : Fakes. (From: Stamp bulletin of the Australian Post). 1996. 49: 28.
ST.PIERE, D. : Misc. older stamps. / Traena Island, Norway; Cayman Islands. 1983. 11: 15.
STRECKER, M. : Stamps feature rock art of Bolivia. 1994. 44: 8.
STROTHER, M. : Mammoth cave, KY. Cancellations. 1984. 17: 20-21.
SZENTES, G. : More news about the Vietnam stamps. 1986. 23: 6.

TEAL, S.H. : Some “Cave” Post Office listings for the U.S.A. 1988. 28: 14.

VEIT, U. & VAN SOEREN, J.C. : Die Bilsteinhöhlen Warstein. 1984. 16: 2.

WEST, C.C. : About the 1979 Jersey bat-stamp. 1993. 41: 3
WILKIE, D.B. : Megaloceros flabellatus. 1993. 41: B.
WILKIE, D.B. : Homo erectus (Sinanthropus pekinensis). 1994. 42: 26.
WILKIE, D.B. : Bat listing. 1994. 43: 10-15.

YINQUING, L. : Behind the design of the Commemorative Postal Card... XI Int. Congress of Spel. China 1993. 1994. 43: 8.